Before you start ripping her apart, have you washed and waxed it yet? For the restore to be 20+? years old, it looks like whatever work was done has held up really well, therefore, looks like a great start to me. I'd have to roll in it a bit before I tore it apart.
It seems like I remember seeing that truck in magazines way back in the day... did the PO give you any history on it?
It's a shame the only usable panels from your truck can't be used on this
Definitely needs a 67 clip and some marker shaving